ADE7566ASTZF8 Analog Devices Inc, ADE7566ASTZF8 Datasheet - Page 64

• Manufacturer Part Number: ADE7566ASTZF8
• Description: IC ENERGY METER MCU 8K 64LQFP
• Manufacturer: Analog Devices Inc

Specifications of ADE7566ASTZF8

• Applications: Energy Measurement
• Core Processor: 8052
• Program Memory Type: FLASH (8 kB)
• Controller Series: ADE75xx
• Ram Size: 512 x 8
• Interface: I²C, SPI, UART
• Number Of I /o: 20
• Voltage - Supply: 3.135 V ~ 3.465 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 64-LQFP
• Ic Function: Single Phase Energy Measurement IC
• Supply Voltage Range: 3.13V To 3.46V, 2.4V To 3.7V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: LQFP
• No. Of Pins: 64
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ADE7116/ADE7156/ADE7166/ADE7169/ADE7566/ADE7569
ACTIVE ENERGY CALCULATION
As stated in the Active Power Calculation section, power is
defined as the rate of energy flow. This relationship can be
expressed mathematically, as shown in Equation 13.
where:
P is power.
E is energy.
Conversely, energy is given as the integral of power.
The ADE7116/ADE7156/ADE7166/ADE7169/ADE7566/
ADE7569 achieve the integration of the active power signal by
continuously accumulating the active power signal in an
internal, nonreadable, 49-bit energy register. The register
(WATTHR[23:0], Address 0x01) represents the upper 24 bits
of this internal register. This discrete time accumulation or
summation is equivalent to integration in continuous time.
Equation 15 expresses the relationship.
where:
n is the discrete time sample number.
T is the sample period.
The discrete time sample period (T) for the accumulation
register in the ADE7116/ADE7156/ADE7166/ADE7169/
ADE7566/ADE7569 is 1.22 μs (5/MCLK). In addition to
calculating the energy, this integration removes any sinusoidal
components that may be in the active power signal. Figure 66
shows this discrete time integration or accumulation. The active
E
P =
E
=
=
∫
∫
dE
p
dt
P
) (
t
) (
t
dt
CURRENT
CHANNEL
CHANNEL
VOLTAGE
dt
=
lim
t
→
0
⎧
⎨
⎩
∑
n
∞
=
1
p
(
nT
T
)
×
T
⎫
⎬
⎭
ACTIVE POWER
LPF2
CLKIN
sgn
SIGNAL
5
TIME (nT)
WATTOS[15:0]
2
6
2
+
5
+
WAVEFORM
2
REGISTER
–6
VALUES
2
–7
Figure 66. Active Energy Calculation
2
–8
FOR WAVEFORM
SAMPLING
WGAIN[11:0]
(13)
(14)
(15)
Rev. B | Page 64 of 152
WDIV[7:0]
%
power signal in the waveform register is continuously added to
the internal active energy register.
The active energy accumulation depends on the setting of
POAM (Bit 1) and ABSAM (Bit 0) in the ACCMODE register
(Address 0x0F). When both bits are cleared, the addition is
signed and, therefore, negative energy is subtracted from the
active energy contents. When both bits are set, the ADE7166/
ADE7169/ADE7566/ADE7569 are set to be in the more
restrictive mode, the positive-only accumulation mode.
When POAM (Bit 1) in the ACCMODE register (Address 0x0F)
is set, only positive power contributes to the active energy
accumulation. When ABSAM (Bit 0) in the ACCMODE
register (Address 0x0F) is set, the absolute active power is used
for the active energy accumulation (see the Watt-Absolute
Accumulation Mode section).
The output of the multiplier is divided by the value in the WDIV
register (Address 0x24). If the value in the WDIV register is
equal to 0, the internal active energy register is divided by 1.
WDIV is an 8-bit, unsigned register. After dividing by WDIV,
the active energy is accumulated in a 49-bit internal energy
accumulation register. The upper 24 bits of this register are
accessible through a read to the active energy register
(WATTHR[23:0], Address 0x01). A read to the RWATTHR
register (Address 0x02) returns the contents of the WATTHR
register, and the upper 24 bits of the internal register are cleared.
As shown in Figure 66, the active power signal is accumulated
in an internal 49-bit signed register. The active power signal can
be read from the waveform register by setting the WAVMODE
register (Address 0x0D) and setting the WFSM bit (Bit 5) in the
Interrupt Enable 3 SFR (MIRQENH, Address 0xDB). Like the
current and voltage channels waveform sampling modes, the
waveform data is available at sample rates of 25.6 kSPS, 12.8 kSPS,
6.4 kSPS, and 3.2 kSPS.
TO
DIGITAL-TO-FREQUENCY
CONVERTER
+
+
48
23
WATTHR[23:0]
OUTPUTS FROM THE LPF2 ARE
ACCUMULATED (INTEGRATED) IN
THE INTERNAL ACTIVE ENERGY REGISTER
0
UPPER 24 BITS ARE
ACCESSIBLE THROUGH
WATTHR[23:0] REGISTER
0